HTC Leo could be called HD2, oh and there's a video of the UI

The HTC Leo has been churning in the rumor mill for quite a while but it's all coming to an end - it's launching in October. On the list of rumors we've assembled for today there's a new name, price and even a video of would likely be the TouchFLO version that the device uses.
First up, the name...

If it's goping to be called the 'HD2', then why does the O2 'document' (and I use that term grudgingly given it seems to be a couple of lines of text printed onto blank white paper, picture NEXT to an O2 brochure - in no way official or proof of anything) refer to it as 'Leo'?